Trouble Using GPT-4

[haverAI]

Hello all,

I got an email from Open AI saying "You're invited to use the OpenAI GPT-4 API!" I had been using a GPT-3.5 on this clone perfectly fine, but I would like to now use GPT-4. When I switch the button from 3.5 to 4.0 on the front-end and enter in my command, nothing happens, and in the terminal:

Error in stream: list index out of range
Chunk: b' "message": "The model: gpt-4 does not exist",'

Could anyone provide some insight into this? Sorta new to this. Would be greatly appreciated.

Thanks!